Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 31 July | |
VRS Castricum | 31 July | |||
| 2021 | |
VRS Castricum | 31 March | |
VRS Castricum | 31 March | |||
| 2020 | |
VRS Castricum | 5 April | |
VRS Castricum | 17 April | |||
| 2019 | |
VRS Castricum | 20 April | |
VRS Castricum | 24 October | |||
| 2018 | |
VRS Castricum | 12 April | |
VRS Castricum | 29 August | |||
| 2017 | |
VRS Castricum | 8 August | |
VRS Castricum | 26 August | |||
| 2016 | |
VRS Castricum | 14 April | |
VRS Castricum | 21 April | |||
| 2015 | |
VRS Castricum | 20 August | |
VRS Castricum | 20 August | |||
| 2014 | |
VRS Castricum | 5 August | |
VRS Castricum | 5 August | |||
| 2013 | |
VRS Castricum | 2 August | |
VRS Castricum | 2 August | |||
| 2012 | |
VRS Castricum | 25 July | |
VRS Castricum | 17 August | |||
| 2011 | |
VRS Castricum | 11 April | |
VRS Castricum | 26 August | |||
| 2010 | |
VRS Castricum | 21 July | |
VRS Castricum | 21 July | |||
| 2009 | |
VRS Castricum | 7 April | |
VRS Castricum | 1 September | |||
| 2008 | |
VRS Castricum | 24 July | |
VRS Castricum | 16 September | |||
| 2007 | |
VRS Castricum | 6 August | |
VRS Castricum | 21 August | |||
| 2006 | |
VRS Castricum | 25 April | |
VRS Castricum | 24 September | |||
| 2005 | |
VRS Castricum | 15 July | |
VRS Castricum | 6 September | |||
| 2004 | |
VRS Castricum | 17 April | |
VRS Castricum | 2 September | |||
| 2003 | |
VRS Castricum | 29 March | |
VRS Castricum | 12 August | |||
| 2002 | |
VRS Castricum | 3 April | |
VRS Castricum | 28 September | |||
| 2001 | |
VRS Castricum | 16 August | |
VRS Castricum | 25 August | |||
| 2000 | |
VRS Castricum | 24 August | |
VRS Castricum | 30 September | |||
| 1999 | |
VRS Castricum | 1 August | |
VRS Castricum | 19 September | |||
| 1998 | |
VRS Castricum | 23 April | |
VRS Castricum | 4 October | |||
| 1997 | |
VRS Castricum | 6 August | |
VRS Castricum | 24 August | |||
| 1996 | |
VRS Castricum | 10 August | |
VRS Castricum | 17 September | |||
| 1989 | |
VRS Castricum | 22 August | |
VRS Castricum | 22 August |
